Have to disagree with glacial on the valk difficulty. She is not easy to master. Getting your perfect dodges and keeping your rotation up while boss interrupts is at least medium difficulty. Valk is not a class for beginners cause you get punished harder as everyone else when you die.
Archer is top tier right now bc he is easy to play and easy to master. Also extremly save for beginners. Would recommend Archer for every beginner who doesnt know any dugeon or how the game works.